142 AET. II. A. IZÜKA : 



and posterior (downward) curves are not conspicuous. The posterior 

 processes are remarkable for their great length and acutely pointed 

 condition. Each great dental plate has four teeth. The some- 

 what triangular horny region behind the dentary is marked 

 off by a deep suture. The anterior plate is irregularly 

 triangular, with a long tooth internally. Near the latter is an 

 isolated accessory plate. A thin horny bar of ordinary appear- 

 ance runs backward to the maxilla. The ventral surface of the 

 mandibles presents the appearance of a Telllna shell. It is 

 deeply coloured with blackish pigment and is veined. Three 

 characteristically symmetrical horny plates (two lateral and one 

 great dental) are visible on each side of the ventral surface, 

 and the angle of the posterior (great dental) plate is distinct. 



Habitat : — Gulf of ]SIiya (Marenzeller) ; TIanéda in Prov. 

 Musashi (!) ; Nishinoyodomi in Sagami Bay, about 160 fathoms; 

 Suruga Bay and Totomi Sea (" Albatross ") ; Off Yokohama and 

 off Kobe ("Challenger"); Tomo Harbour in Prov. Bingo (!) : 



Lunihriconereis hifurcata Mcintosh. 



PL XIV, fig. 20. 



18o5. LnniValconereis bifurcita, Mclntosli. " Glial leiiger" Auuel., p. 211, 

 PI. XXXVI, figs. 10-12. 



The prostomium forms a somewhat acute cone, dorsally 

 marked with a few longitudinal streaks. 



The Ijody is slightly tapering in front, remains for a con- 

 siderable distance in nearly uniform breadth, and again tapers 

 toward the tail-end. It measures 130-145 mm. in lengtli and 

 about .") mm. in breadth. 



The parapodiiim in the posterior part of the Ijody consists of 



